Multiple calls to UseOwin is discouraged?

[oconnor0]

In https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/fundamentals/owin.md, there is a comment that says:

Note:
Multiple calls to UseOwin is discouraged for performance reasons. OWIN components will operate best if grouped together.

Does this mean that the following code is not a good idea? If so, why and what should it be instead? It's not obvious to me that this would be slower than some other structure, but maybe the comment is referring to something else.

app.Map("/a", a => a.UseOwin(pipeline => pipeline(next => HandleA)));
app.Map("/b", a => a.UseOwin(pipeline => pipeline(next => HandleB)));